CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-41045 – bpf: Defer work in bpf_timer_cancel_and_free
https://notcve.org/view.php?id=CVE-2024-41045
In the Linux kernel, the following vulnerability has been resolved: bpf: Defer work in bpf_timer_cancel_and_free Currently, the same case as previous patch (two timer callbacks trying to cancel each other) can be invoked through bpf_map_update_elem as well, or more precisely, freeing map elements containing timers. Since this relies on hrtimer_cancel as well, it is prone to the same deadlock situation as the previous patch. It would be sufficient to use hrtimer_try_to_cancel to fix this problem, as the timer cannot be enqueued after async_cancel_and_free. Once async_cancel_and_free has been done, the timer must be reinitialized before it can be armed again. The callback running in parallel trying to arm the timer will fail, and freeing bpf_hrtimer without waiting is sufficient (given kfree_rcu), and bpf_timer_cb will return HRTIMER_NORESTART, preventing the timer from being rearmed again. However, there exists a UAF scenario where the callback arms the timer before entering this function, such that if cancellation fails (due to timer callback invoking this routine, or the target timer callback running concurrently). In such a case, if the timer expiration is significantly far in the future, the RCU grace period expiration happening before it will free the bpf_hrtimer state and along with it the struct hrtimer, that is enqueued. Hence, it is clear cancellation needs to occur after async_cancel_and_free, and yet it cannot be done inline due to deadlock issues. • https://git.kernel.org/stable/c/b00628b1c7d595ae5b544e059c27b1f5828314b4 https://git.kernel.org/stable/c/7aa5a19279c3639ae8b758b63f05d0c616a39fa1 https://git.kernel.org/stable/c/a6fcd19d7eac1335eb76bc16b6a66b7f574d1d69 •
CVSS: 4.9EPSS: 0%CPEs: 8EXPL: 0CVE-2024-41044 – ppp: reject claimed-as-LCP but actually malformed packets
https://notcve.org/view.php?id=CVE-2024-41044
In the Linux kernel, the following vulnerability has been resolved: ppp: reject claimed-as-LCP but actually malformed packets Since 'ppp_async_encode()' assumes valid LCP packets (with code from 1 to 7 inclusive), add 'ppp_check_packet()' to ensure that LCP packet has an actual body beyond PPP_LCP header bytes, and reject claimed-as-LCP but actually malformed data otherwise. • https://git.kernel.org/stable/c/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 https://git.kernel.org/stable/c/97d1efd8be26615ff680cdde86937d5943138f37 https://git.kernel.org/stable/c/6e8f1c21174f9482033bbb59f13ce1a8cbe843c3 https://git.kernel.org/stable/c/3ba12c2afd933fc1bf800f6d3f6c7ec8f602ce56 https://git.kernel.org/stable/c/ebc5c630457783d17d0c438b0ad70b232a64a82f https://git.kernel.org/stable/c/3134bdf7356ed952dcecb480861d2afcc1e40492 https://git.kernel.org/stable/c/099502ca410922b56353ccef2749bc0de669da78 https://git.kernel.org/stable/c/d683e7f3fc48f59576af34631b4fb07fd • CWE-20: Improper Input Validation •
CVSS: -EPSS: 0%CPEs: 2EXPL: 0CVE-2024-41043 – netfilter: nfnetlink_queue: drop bogus WARN_ON
https://notcve.org/view.php?id=CVE-2024-41043
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: drop bogus WARN_ON Happens when rules get flushed/deleted while packet is out, so remove this WARN_ON. This WARN exists in one form or another since v4.14, no need to backport this to older releases, hence use a more recent fixes tag. • https://git.kernel.org/stable/c/3f801968889459ecae1eab524b039676e6eaa319 https://git.kernel.org/stable/c/86858da8335db48bde9be02abd7156a69d622e86 https://git.kernel.org/stable/c/631a4b3ddc7831b20442c59c28b0476d0704c9af •
CVSS: -EPSS: 0%CPEs: 8EXPL: 0CVE-2024-41042 – netfilter: nf_tables: prefer nft_chain_validate
https://notcve.org/view.php?id=CVE-2024-41042
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: prefer nft_chain_validate nft_chain_validate already performs loop detection because a cycle will result in a call stack overflow (ctx->level >= NFT_JUMP_STACK_SIZE). It also follows maps via ->validate callback in nft_lookup, so there appears no reason to iterate the maps again. nf_tables_check_loops() and all its helper functions can be removed. This improves ruleset load time significantly, from 23s down to 12s. This also fixes a crash bug. Old loop detection code can result in unbounded recursion: BUG: TASK stack guard page was hit at .... Oops: stack guard page: 0000 [#1] PREEMPT SMP KASAN CPU: 4 PID: 1539 Comm: nft Not tainted 6.10.0-rc5+ #1 [..] with a suitable ruleset during validation of register stores. I can't see any actual reason to attempt to check for this from nft_validate_register_store(), at this point the transaction is still in progress, so we don't have a full picture of the rule graph. For nf-next it might make sense to either remove it or make this depend on table->validate_state in case we could catch an error earlier (for improved error reporting to userspace). • https://git.kernel.org/stable/c/20a69341f2d00cd042e81c82289fba8a13c05a25 https://git.kernel.org/stable/c/1947e4c3346faa8ac7e343652c0fd3b3e394202f https://git.kernel.org/stable/c/cd4348e0a50286282c314ad6d2b0740e7c812c24 https://git.kernel.org/stable/c/31c35f9f89ef585f1edb53e17ac73a0ca4a9712b https://git.kernel.org/stable/c/8246b7466c8da49d0d9e85e26cbd69dd6d3e3d1e https://git.kernel.org/stable/c/b6b6e430470e1c3c5513311cb35a15a205595abe https://git.kernel.org/stable/c/717c91c6ed73e248de6a15bc53adefb81446c9d0 https://git.kernel.org/stable/c/9df785aeb7dcc8efd1d4110bb27d26005 •
CVSS: 4.7EPSS: 0%CPEs: 7EXPL: 0CVE-2024-41041 – udp: Set SOCK_RCU_FREE earlier in udp_lib_get_port().
https://notcve.org/view.php?id=CVE-2024-41041
In the Linux kernel, the following vulnerability has been resolved: udp: Set SOCK_RCU_FREE earlier in udp_lib_get_port(). syzkaller triggered the warning [0] in udp_v4_early_demux(). In udp_v[46]_early_demux() and sk_lookup(), we do not touch the refcount of the looked-up sk and use sock_pfree() as skb->destructor, so we check SOCK_RCU_FREE to ensure that the sk is safe to access during the RCU grace period. Currently, SOCK_RCU_FREE is flagged for a bound socket after being put into the hash table. Moreover, the SOCK_RCU_FREE check is done too early in udp_v[46]_early_demux() and sk_lookup(), so there could be a small race window: CPU1 CPU2 ---- ---- udp_v4_early_demux() udp_lib_get_port() | |- hlist_add_head_rcu() |- sk = __udp4_lib_demux_lookup() | |- DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk)); `- sock_set_flag(sk, SOCK_RCU_FREE) We had the same bug in TCP and fixed it in commit 871019b22d1b ("net: set SOCK_RCU_FREE before inserting socket into hashtable"). Let's apply the same fix for UDP. [0]: WARNING: CPU: 0 PID: 11198 at net/ipv4/udp.c:2599 udp_v4_early_demux+0x481/0xb70 net/ipv4/udp.c:2599 Modules linked in: CPU: 0 PID: 11198 Comm: syz-executor.1 Not tainted 6.9.0-g93bda33046e7 #13 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:udp_v4_early_demux+0x481/0xb70 net/ipv4/udp.c:2599 Code: c5 7a 15 fe bb 01 00 00 00 44 89 e9 31 ff d3 e3 81 e3 bf ef ff ff 89 de e8 2c 74 15 fe 85 db 0f 85 02 06 00 00 e8 9f 7a 15 fe <0f> 0b e8 98 7a 15 fe 49 8d 7e 60 e8 4f 39 2f fe 49 c7 46 60 20 52 RSP: 0018:ffffc9000ce3fa58 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8318c92c RDX: ffff888036ccde00 RSI: ffffffff8318c2f1 RDI: 0000000000000001 RBP: ffff88805a2dd6e0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0001ffffffffffff R12: ffff88805a2dd680 R13: 0000000000000007 R14: ffff88800923f900 R15: ffff88805456004e FS: 00007fc449127640(0000) GS:ffff88807dc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc449126e38 CR3: 000000003de4b002 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 PKRU: 55555554 Call Trace: <TASK> ip_rcv_finish_core.constprop.0+0xbdd/0xd20 net/ipv4/ip_input.c:349 ip_rcv_finish+0xda/0x150 net/ipv4/ip_input.c:447 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0x16c/0x180 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0xb3/0xe0 net/core/dev.c:5624 __netif_receive_skb+0x21/0xd0 net/core/dev.c:5738 netif_receive_skb_internal net/core/dev.c:5824 [inline] netif_receive_skb+0x271/0x300 net/core/dev.c:5884 tun_rx_batched drivers/net/tun.c:1549 [inline] tun_get_user+0x24db/0x2c50 drivers/net/tun.c:2002 tun_chr_write_iter+0x107/0x1a0 drivers/net/tun.c:2048 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x76f/0x8d0 fs/read_write.c:590 ksys_write+0xbf/0x190 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __x64_sys_write+0x41/0x50 fs/read_write.c:652 x64_sys_call+0xe66/0x1990 arch/x86/include/generated/asm/syscalls_64.h:2 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x4b/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7fc44a68bc1f Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 e9 cf f5 ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 3c d0 f5 ff 48 RSP: 002b:00007fc449126c90 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00000000004bc050 RCX: 00007fc44a68bc1f R ---truncated--- • https://git.kernel.org/stable/c/6acc9b432e6714d72d7d77ec7c27f6f8358d0c71 https://git.kernel.org/stable/c/7a67c4e47626e6daccda62888f8b096abb5d3940 https://git.kernel.org/stable/c/9f965684c57c3117cfd2f754dd3270383c529fba https://git.kernel.org/stable/c/ddf516e50bf8a7bc9b3bd8a9831f9c7a8131a32a https://git.kernel.org/stable/c/a6db0d3ea6536e7120871e5448b3032570152ec6 https://git.kernel.org/stable/c/c5fd77ca13d657c6e99bf04f0917445e6a80231e https://git.kernel.org/stable/c/20ceae10623c3b29fdf7609690849475bcdebdb0 https://git.kernel.org/stable/c/5c0b485a8c6116516f33925b9ce5b6104 • CWE-911: Improper Update of Reference Count •